CN108757198B - Self-learning method and device for starting fuel injection quantity of engine - Google Patents
Self-learning method and device for starting fuel injection quantity of engine Download PDFInfo
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- CN108757198B CN108757198B CN201810603083.1A CN201810603083A CN108757198B CN 108757198 B CN108757198 B CN 108757198B CN 201810603083 A CN201810603083 A CN 201810603083A CN 108757198 B CN108757198 B CN 108757198B
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- 238000002347 injection Methods 0.000 title claims abstract description 181
- 239000007924 injection Substances 0.000 title claims abstract description 181
- 239000000446 fuel Substances 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000002485 combustion reaction Methods 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 230000008569 process Effects 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 230000032683 aging Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000013459 approach Methods 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
- F02D41/2464—Characteristics of actuators
- F02D41/2467—Characteristics of actuators for injectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention discloses a self-learning method and device for starting fuel injection quantity of an engine, and belongs to the technical field of engines. The self-learning method comprises the following steps: determining a temperature parameter of the vehicle according to the water tank temperature when the engine is started; determining an oil injection quantity step length according to the temperature parameter, wherein the oil injection quantity step length is the variable quantity of the oil injection quantity between two adjacent ignition periods of the engine; and when the difference exists between the successfully counted combustion number of the engine and the preset number, adjusting the oil injection quantity parameter of the engine according to the oil injection quantity step length. The invention solves the problem that the starting fuel injection quantity of the engine is not easy to be reasonably calibrated under the conditions of different oil differences and aging of a fuel system.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to a self-learning method and device for starting fuel injection quantity of an engine.
Background
In the process of starting the automobile, the starter drives the engine flywheel to rotate, and meanwhile, the oil injection nozzle injects oil and the spark plug ignites to achieve starting of the engine.
Due to the fact that domestic oil products are different, if fuel with poor oil products is added to an automobile, the engine can not be started normally under the condition of normal calibrated fuel injection concentration. In order to solve the above problem, automobile manufacturers usually calibrate the fuel injection concentration at the time of starting the automobile to be higher so as to ensure that the automobile can be started normally.
However, if the automobile is added with fuel with good oil, the emission of the automobile exceeds the standard due to the over-high calibration of the fuel injection concentration, and the environmental protection is not facilitated.
Disclosure of Invention
The embodiment of the invention provides a self-learning method and device for starting fuel injection quantity of an engine, which can solve the problem that the starting fuel injection quantity of the engine is difficult to calibrate reasonably. The technical scheme is as follows:
in one aspect, the embodiment of the invention provides a self-learning method for starting fuel injection quantity of an engine, which comprises the following steps:
determining a temperature parameter of the vehicle according to the water tank temperature when the engine is started;
determining an oil injection quantity step length according to the temperature parameter, wherein the oil injection quantity step length is the variable quantity of the oil injection quantity between two adjacent ignition periods of the engine;
and when a difference exists between the successfully counted combustion number of the engine and the preset number, adjusting the oil injection quantity parameter of the engine according to the oil injection quantity step length.
Further, the determining the temperature parameter of the vehicle according to the water tank temperature comprises:
determining a temperature parameter of the vehicle according to a water tank temperature when the vehicle meets a self-learning start condition, wherein the self-learning start condition comprises that the engine is not started successfully, the rotating speed of the engine is lower than a rotating speed threshold value, the engine is started in a cold state, a starting system of the engine has no fault, and a starting process of the engine has no interruption.
Further, the temperature parameter includes any one of a first temperature range, a second temperature range and a third temperature range, the first temperature range is-10 ℃ to 15 ℃, the second temperature range is 15 ℃ to 25 ℃, and the third temperature range is 25 ℃ to 45 ℃.
Further, the determining the oil injection quantity step length according to the temperature parameter comprises:
when the temperature parameter of the engine during starting is a first temperature range, taking the fuel injection quantity step length corresponding to the first temperature range as a basic step length, taking the fuel injection quantity step length corresponding to the second temperature range as the basic step length multiplied by a weighting coefficient, and taking the fuel injection quantity step length corresponding to the third temperature range as the basic step length multiplied by the weighting coefficient;
when the temperature parameter of the engine during starting is in a second temperature range, taking the fuel injection quantity step length corresponding to the second temperature range as a basic step length, wherein the fuel injection quantity step length corresponding to the first temperature range and the fuel injection quantity step length corresponding to the third temperature range are both basic step length multiplied by a weighting coefficient;
when the temperature parameter of the engine during starting is a third temperature range, the fuel injection quantity step length corresponding to the third temperature range is used as a basic step length, the fuel injection quantity step length corresponding to the second temperature range is a basic step length multiplied by a weighting coefficient, and the fuel injection quantity step length corresponding to the first temperature range is a basic step length multiplied by a weighting coefficient.
Further, the adjusting the oil injection quantity parameter of the engine according to the oil injection quantity step length comprises:
when the number of successfully counted combustion of the engine in a single ignition period is larger than the preset number, the fuel injection quantity parameter is reduced according to the fuel injection quantity step length;
and when the successfully counted number of the combustion of the engine in a single ignition period is not more than the preset number, the fuel injection quantity parameter is increased according to the fuel injection quantity step length.
Further, the self-learning method further comprises:
during the period of meeting the combustion estimation condition, if the rotating speed difference of a crankshaft of the engine in two adjacent ignition periods is larger than a threshold value, the combustion success counting quantity is increased by one;
the combustion estimation condition includes that ignition of the engine is synchronized and within a number of ignition cycles after the ignition synchronization.
Further, the threshold value is determined according to an altitude correction coefficient, the temperature parameter and a basic rotating speed.
Further, the self-learning method further comprises:
and when the vehicle does not meet the self-learning starting condition, setting the fuel injection quantity parameter as a basic value, wherein the basic value is a set value.
Further, the self-learning method further comprises:
and taking the oil injection quantity parameter determined when the last ignition of the vehicle is finished as the initial oil injection quantity parameter when the current ignition of the vehicle is started.
In another aspect, the apparatus comprises:
the temperature module is used for determining the temperature parameter of the vehicle according to the temperature of the water tank when the engine is started;
the step length module is used for determining the oil injection quantity step length according to the temperature parameter, wherein the oil injection quantity step length is the variable quantity of the oil injection quantity between two adjacent ignition periods of the engine;
and the adjusting module is used for adjusting the oil injection quantity parameter of the engine according to the oil injection quantity step length when a difference value exists between the successfully counted combustion quantity of the engine and the preset times.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
and when the difference exists between the successfully counted combustion quantity of the engine and the preset times, the oil injection quantity parameter of the engine is adjusted according to the oil injection quantity step length. In the embodiment of the invention, in each ignition period of the engine, if a difference exists between the successfully-combusted counting number and the preset number, the fuel injection quantity parameter of the engine can be adjusted according to the fuel injection quantity step length, so that the fuel injection quantity parameter of the engine gradually approaches to a reasonable value along with the lapse of the ignition period, and the engine can be started by proper fuel injection quantity. Solves the problem that the starting fuel injection quantity of the engine is not easy to be reasonably calibrated under the conditions of different oil differences and aging of a fuel system
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for self-learning engine starting fuel injection quantity provided by an embodiment of the invention;
FIG. 2 is a flow chart of another method for self-learning engine starting fueling injection provided by an embodiment of the present invention;
FIG. 3 is a graph of a base curve of threshold values provided by an embodiment of the present invention;
FIG. 4 is a simulation diagram of a self-learning method for engine starting fuel injection provided by an embodiment of the invention;
fig. 5 is a schematic structural diagram of a self-learning device for engine starting fuel injection quantity according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The embodiment of the invention provides a self-learning method for starting fuel injection quantity of an engine, which can be executed by a vehicle-mounted computer of a vehicle, and as shown in figure 1, the self-learning method comprises the following steps:
step 101: the temperature parameter of the vehicle is determined according to the water tank temperature when the engine is started.
Wherein, the water tank temperature CAN be gathered by the temperature sensor in the water tank, transmits to on-vehicle computer through the CAN bus of vehicle.
Step 102: and determining the step length of the injected fuel quantity according to the temperature parameter, wherein the step length of the injected fuel quantity is the variable quantity of the injected fuel quantity between two adjacent ignition periods of the engine.
Step 103: and when the difference exists between the successfully counted combustion number of the engine and the preset number, adjusting the oil injection quantity parameter of the engine according to the oil injection quantity step length.
In the embodiment of the invention, the temperature parameter of the vehicle is determined according to the temperature of the water tank, so that the oil injection quantity step length can be determined according to the temperature parameter, wherein the oil injection quantity step length is the variation of the oil injection quantity between two adjacent ignition periods of the engine, and when the difference exists between the combustion success counting number and the preset number of the engine, the oil injection quantity parameter of the engine is adjusted according to the oil injection quantity step length. In the embodiment of the invention, in each ignition period of the engine, if a difference exists between the successfully-combusted counting number and the preset number, the fuel injection quantity parameter of the engine can be adjusted according to the fuel injection quantity step length, so that the fuel injection quantity parameter of the engine gradually approaches to a reasonable value along with the lapse of the ignition period, and the engine can be started by proper fuel injection quantity. The problem that the starting fuel injection quantity of an engine is not easy to reasonably calibrate under the conditions of different oil differences and aging of a fuel system is solved.
Fig. 2 is a flowchart of another self-learning method for engine start fuel injection according to an embodiment of the present invention, which may be executed by an on-board computer of a vehicle, referring to fig. 2, the self-learning method includes:
step 201: the vehicle-mounted computer judges whether the oil injection quantity parameter determined when the ignition of the engine is finished last time is stored, if the oil injection quantity parameter determined when the ignition of the engine is finished last time is stored, the oil injection quantity parameter is used as the initial oil injection quantity parameter when the ignition is started this time, and then step 202 is executed; if the fuel injection quantity parameter determined at the end of the last engine ignition is not stored, the initial fuel injection quantity parameter is assigned, and then step 202 is executed.
In the above implementation, the fuel injection parameter determined at the end of ignition refers to the fuel injection parameter determined in the last ignition cycle during the process of starting the engine. The initial injection quantity parameter at the start of ignition refers to the injection quantity parameter executed in the first ignition cycle during the start of the engine.
The fuel injection quantity parameter is used for calculating the fuel injection quantity, and when the fuel injection quantity parameter is realized, the fuel injection quantity parameter and the fuel injection quantity can form a positive correlation relation.
Step 202: the vehicle-mounted computer determines the temperature parameter of the vehicle according to the temperature of the water tank when the engine is started.
The method for acquiring the temperature of the water tank in this step is the same as that in step 101, and is not described herein again.
This step 202 may include: and when the vehicle meets the self-learning starting condition, determining the temperature parameter of the vehicle according to the temperature of the water tank.
Optionally, the self-learning start condition includes an unsuccessful start of the engine, a speed of the engine being below a speed threshold, the engine being cold started, no malfunction of a starting system of the engine, no interruption of a starting process of the engine.
In the above implementation, for "unsuccessful engine start", the number of successful ignition times of the engine after ignition synchronization may be used as a judgment, for example, when the engine is after ignition synchronization and within 10 successful ignition times, the engine is judged not to be normally started. The "engine speed is lower than the speed threshold", which is an artificial set value and may be set to 1200 Rpm. For "the engine is cold started", a comparison may be made between ambient temperature and the temperature in the engine water tank to conclude that the engine is cold started. Aiming at the facts that the starting system of the engine has no fault and the starting process of the engine has no interruption, the starting system can be detected by a vehicle-mounted computer.
In this embodiment, the engine does not begin self-learning if the engine meets any of the following conditions:
(1) the speed of the automobile is greater than 0; (2) the rotating speed of the engine is greater than or equal to a rotating speed threshold value, the rotating speed threshold value is an artificial set value, and is preferably set to be 1200 Rpm; (3) the engine is in a hot start state, for example, the automobile is in an automatic start-stop state, or the engine just stops soon, and specific judgment can be carried out by combining the temperature of the water tank; (4) the engine is normally started and can be judged by the successful ignition times of the engine after the ignition synchronization, for example, when the engine is successfully ignited more than 10 times after the ignition synchronization, the engine is judged to be normally started; (5) and the engine is synchronized again. The engine resynchronization means that the timing signal needs to be recalculated by the vehicle-mounted computer to find the timing synchronization signal again when the timing signals of the crankshaft and the camshaft are lost during the operation of the engine. Thus, when the engine is resynchronized, it indicates that the engine has been normally started; (6) faults of the automobile, such as faults of an evaporation system, faults of a battery, faults of a rotating speed signal, faults of a phase signal, faults of a water temperature signal, faults of a vehicle speed signal, faults of an oil sprayer, faults of a fire and the like; (7) the cell voltage is too low and accumulates a certain number of times, for example the cell voltage is below 7.5V and accumulates more than 20 times.
When the vehicle does not meet the self-learning starting condition, the fuel injection quantity parameter is set as a basic value, and the basic value is a set value, namely the assigned initial fuel injection quantity parameter.
Specifically, the temperature parameter includes any one of a first temperature range of-10 ℃ to 15 ℃, a second temperature range of 15 ℃ to 25 ℃, and a third temperature range of 25 ℃ to 45 ℃.
In the implementation mode, when the temperature parameter is less than-10 ℃ or more than 45 ℃, the starting fuel injection quantity of the engine does not have general referential property, and in order to avoid influencing the starting fuel injection quantity under the normal condition, the temperature parameter is only taken from-10 ℃ to 45 ℃.
It should be noted that the number of temperature ranges and the value of each temperature range can be adjusted according to actual requirements, and the present invention is not limited thereto.
Step 203: and the vehicle-mounted computer determines the oil injection quantity step length according to the temperature parameter, wherein the oil injection quantity step length is the variable quantity of the oil injection quantity between two adjacent ignition periods of the engine.
Optionally, when the first temperature parameter determined when the engine is started is a first temperature range, the fuel injection quantity step length corresponding to the first temperature range is taken as a basic step length, the fuel injection quantity step length corresponding to the second temperature range is taken as a basic step length multiplied by a weighting coefficient, and the fuel injection quantity step length corresponding to the third temperature range is taken as a basic step length multiplied by a weighting coefficient.
And when the first temperature parameter determined when the engine is started is a second temperature range, taking the fuel injection quantity step length corresponding to the second temperature range as a basic step length, wherein the fuel injection quantity step length corresponding to the first temperature range and the fuel injection quantity step length corresponding to the third temperature range are both basic step length multiplied by a weighting coefficient.
When the first temperature parameter determined when the engine is started is a third temperature range, the fuel injection quantity step length corresponding to the third temperature range is used as a basic step length, the fuel injection quantity step length corresponding to the second temperature range is used as a basic step length multiplied by a weighting coefficient, and the fuel injection quantity step length corresponding to the first temperature range is used as a basic step length multiplied by a weighting coefficient.
In the above implementation, the weighting coefficient and the basic step size may be selected according to actual requirements.
Taking the temperature parameter of the engine at the time of starting as the first temperature range as an example, step 203 is explained, first, the fuel injection quantity step length corresponding to the first temperature range is taken as the basic step length, then the temperature parameter may change along with the passage of the ignition time, when the temperature parameter changes from the first temperature range to the second temperature range, the fuel injection quantity step length corresponding to the temperature parameter at this time is changed into the basic step length × the weighting coefficient, and if the temperature parameter continues to change from the second temperature range to the third temperature range, the fuel injection quantity step length corresponding to the temperature parameter at this time is changed into the basic step length × the weighting coefficient.
Illustratively, the weighting factor may be 0.5.
Step 204: and when the difference exists between the successfully counted combustion number of the engine and the preset number, the vehicle-mounted computer adjusts the fuel injection quantity parameter of the engine according to the fuel injection quantity step length.
Specifically, the combustion success count of the engine is recorded during a period in which a combustion estimation condition is met, the combustion estimation condition including that the ignition of the engine is synchronized and in a number of ignition cycles after the ignition synchronization.
It should be noted that, all cylinders of the engine are ignited once every 720 degrees of crankshaft rotation, and for a 4-cylinder engine, one ignition cycle is 180 degrees of crankshaft rotation, and 720 degrees of crankshaft rotation means that 4 cylinders are ignited in sequence according to the sequence of the numbers 1-3-4-2. And ignition synchronization means that the vehicle-mounted computer can calculate the serial number of the corresponding ignition cylinder in the current ignition period according to signals of a crankshaft and a camshaft.
Alternatively, the combustion estimation condition is met when the ignition of the engine is synchronized and within 8 ignition periods after the ignition synchronization.
In the above implementation, the preset number is an artificial set value, and may be set to 6. That is, during the period in which the combustion estimation condition is satisfied, the injection quantity parameter is variably adjusted as soon as the combustion success count of the engine is greater than 6 or less than 6.
Alternatively, step 204 may be implemented by:
when the combustion success counting quantity of the engine in a single ignition period is greater than the preset times, reducing the fuel injection quantity parameter according to the fuel injection quantity step length; and when the combustion success counting quantity of the engine in a single ignition period is not more than the preset times, the fuel injection quantity parameter is increased according to the fuel injection quantity step length.
Illustratively, when the engine is a four cylinder engine, a single firing cycle is one firing of each cylinder of the engine in sequence, four firings total.
For example, in an ignition period, when the combustion success count of the engine is greater than the preset number of times, and the step length of the fuel injection quantity is 1, the fuel injection quantity parameter is reduced by 1; when the combustion success count of the engine is less than the preset times and the step length of the fuel injection quantity is 1, adding 1 to the fuel injection quantity parameter; and when the combustion success counting quantity of the engine is equal to the preset times, the fuel injection quantity parameter is unchanged.
It should be noted that, after the self-learning value changes, the self-learning value changes next time based on the changed self-learning value. For example, if the initial injection quantity parameter in step 201 is present, then the injection quantity parameter of the second ignition cycle should be adjusted in a variable manner based on the initial injection quantity parameter in combination with the injection quantity step size.
In the present embodiment, the judgment of the success of combustion is specifically as follows:
during the period of time that the combustion estimation condition is met, if the rotating speed difference of the crankshaft of the engine in two adjacent ignition periods is larger than the threshold value, the combustion success counting amount is increased by one.
If the engine is a four-cylinder engine, the ignition sequence of the four cylinders is 1 cylinder, 3 cylinders, 4 cylinders and 2 cylinders in sequence, and the ignition periods of the 1 cylinder and the 3 cylinders, the 3 cylinder and the 4 cylinders, the 4 cylinder and the 2 cylinder, and the 2 cylinder and the 1 cylinder are two adjacent ignition periods of the engine.
Optionally, the threshold value is determined according to an altitude correction factor, a temperature parameter and a base rotation speed.
In the above implementation manner, the temperature parameter of each range corresponds to a basic value curve table of a threshold, fig. 3 is a basic value curve table of a threshold corresponding to the first temperature range, as shown in fig. 3, in the curve table, the abscissa is the basic rotation speed (starting rotation speed), and the ordinate is the threshold (rotation speed difference), and since the altitude may have a certain influence on the basic rotation speed, the altitude correction is appropriately increased according to the altitude to distinguish the altitude differences of different areas, thereby improving the calculation accuracy.
Fig. 4 is a simulation diagram of a self-learning method of engine starting fuel injection amount, and a detailed flow of the self-learning method of engine starting fuel injection amount is briefly introduced with reference to fig. 4 as follows:
after the engine is started, in a first ignition period, the rotating speed is increased in a small range, the number of the igniters is 4, the number of the combustion success counters is 1, and the number of the combustion success counters is found to be small, so that the fuel injection quantity parameter is increased according to the fuel injection quantity step length, and the corresponding starting fuel injection quantity is increased; in the second ignition period, the normal amplitude of the rotating speed is increased, the number of the ignition meters is 4, the number of the successful combustion meters is 2, and the counting number of the successful combustion meters is normal, so that the fuel injection quantity parameter is unchanged, and the corresponding starting fuel injection quantity is unchanged; in the third ignition period, the rotating speed is not increased, the number of the ignition meters is 4, the number of the successful combustion meters is 0, and the fact that the number of the successful combustion meters is small can be found, so that the fuel injection quantity parameter is increased according to the fuel injection quantity step length, and the corresponding starting fuel injection quantity is increased; in the fourth ignition period, the rotating speed is greatly increased, the number of the igniters is 4, the number of the successful combustion meters is 3, and the number of the successful combustion meters is found to be more, so that the fuel injection quantity parameter is reduced according to the fuel injection quantity step length, and the corresponding starting fuel injection quantity is reduced.
Fig. 5 is a schematic structural diagram of an engine starting fuel injection amount device, which includes, in conjunction with fig. 5:
the temperature module 100 is configured to determine a temperature parameter of the vehicle based on a water tank temperature at engine start.
And the step length module 200 is used for determining an oil injection quantity step length according to the temperature parameter, wherein the oil injection quantity step length is the variable quantity of the oil injection quantity between two adjacent ignition periods of the engine.
The adjusting module 300 is configured to adjust an oil injection parameter of the engine according to the oil injection step length when a difference exists between the successfully counted combustion number of the engine and the preset number of times.
In the embodiment of the invention, the temperature module 100 determines a temperature parameter of a vehicle according to the temperature of a water tank, the step length module 200 determines an oil injection quantity step length according to the temperature parameter, wherein the oil injection quantity step length is a variation of an oil injection quantity between two adjacent ignition periods of an engine, and the adjusting module 300 adjusts the oil injection quantity parameter of the engine according to the oil injection quantity step length when a difference exists between the combustion success counting number of the engine and a preset number. In the embodiment of the invention, in each ignition period of the engine, if a difference exists between the successfully-combusted counting number and the preset number, the fuel injection quantity parameter of the engine can be adjusted according to the fuel injection quantity step length, so that the fuel injection quantity parameter of the engine gradually approaches to a reasonable value along with the lapse of the ignition period, and the engine can be started by proper fuel injection quantity. The problem that the starting fuel injection quantity of an engine is not easy to reasonably calibrate under the conditions of different oil differences and aging of a fuel system is solved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A self-learning method for starting fuel injection quantity of an engine is characterized by comprising the following steps:
determining a temperature parameter of the vehicle according to the water tank temperature when the engine is started;
determining an oil injection quantity step length according to the temperature parameter, wherein the oil injection quantity step length is the variable quantity of the oil injection quantity between two adjacent ignition periods of the engine;
recording the number of successful combustion counts of the engine during a period of time that a combustion estimation condition is met, wherein the combustion estimation condition comprises that the ignition of the engine is synchronized and in a plurality of ignition periods after the ignition is synchronized;
counting the number of successful combustion counts in such a way that, in a period in accordance with the combustion estimation condition, if a difference in rotational speed between the ignition moments of two adjacent cylinders of a crankshaft of the engine is greater than a threshold value, the number of successful combustion counts is increased by one;
and when a difference exists between the successfully counted combustion number of the engine and the preset number, adjusting the oil injection quantity parameter of the engine according to the oil injection quantity step length.
2. The self-learning method of claim 1, wherein the determining a temperature parameter of the vehicle based on the tank temperature comprises:
determining a temperature parameter of the vehicle according to a water tank temperature when the vehicle meets a self-learning start condition, wherein the self-learning start condition comprises that the engine is not started successfully, the rotating speed of the engine is lower than a rotating speed threshold value, the engine is started in a cold state, a starting system of the engine has no fault, and a starting process of the engine has no interruption.
3. The self-learning method of claim 1, wherein the temperature parameter includes any one of a first temperature range, a second temperature range, and a third temperature range, the first temperature range being-10 ℃ to 15 ℃, the second temperature range being 15 ℃ to 25 ℃, the third temperature range being 25 ℃ to 45 ℃.
4. The self-learning method of claim 3, wherein the determining an injection quantity step size according to the temperature parameter comprises:
when the temperature parameter of the engine during starting is a first temperature range, taking the fuel injection quantity step length corresponding to the first temperature range as a basic step length, taking the fuel injection quantity step length corresponding to the second temperature range as the basic step length multiplied by a weighting coefficient, and taking the fuel injection quantity step length corresponding to the third temperature range as the basic step length multiplied by the weighting coefficient;
when the temperature parameter of the engine during starting is in a second temperature range, taking the fuel injection quantity step length corresponding to the second temperature range as a basic step length, wherein the fuel injection quantity step length corresponding to the first temperature range and the fuel injection quantity step length corresponding to the third temperature range are both basic step length multiplied by a weighting coefficient;
when the temperature parameter of the engine during starting is a third temperature range, the fuel injection quantity step length corresponding to the third temperature range is used as a basic step length, the fuel injection quantity step length corresponding to the second temperature range is a basic step length multiplied by a weighting coefficient, and the fuel injection quantity step length corresponding to the first temperature range is a basic step length multiplied by a weighting coefficient.
5. The self-learning method of claim 1, wherein the adjusting the injection quantity parameter of the engine according to the injection quantity step size comprises:
when the number of successfully counted combustion of the engine in a single ignition period is larger than the preset number, the fuel injection quantity parameter is reduced according to the fuel injection quantity step length;
and when the successfully counted number of the combustion of the engine in a single ignition period is not more than the preset number, the fuel injection quantity parameter is increased according to the fuel injection quantity step length.
6. The self-learning method of claim 1, wherein the threshold value is determined based on an altitude correction factor, the temperature parameter, and a base speed.
7. The self-learning method according to any one of claims 1-6, further comprising:
and when the vehicle does not meet the self-learning starting condition, setting the fuel injection quantity parameter as a basic value, wherein the basic value is a set value.
8. The self-learning method according to any one of claims 1-6, further comprising:
and taking the oil injection quantity parameter determined when the last ignition of the vehicle is finished as the initial oil injection quantity parameter when the current ignition of the vehicle is started.
9. A self-learning device for engine start injection, the device comprising:
the temperature module is used for determining the temperature parameter of the vehicle according to the temperature of the water tank when the engine is started;
the step length module is used for determining the oil injection quantity step length according to the temperature parameter, wherein the oil injection quantity step length is the variable quantity of the oil injection quantity between two adjacent ignition periods of the engine;
and the adjusting module is used for adjusting the oil injection quantity parameter of the engine according to the oil injection quantity step length when a difference value exists between the successfully counted combustion quantity of the engine and the preset times.
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| JPS6043149A (en) * | 1983-08-17 | 1985-03-07 | Toyota Motor Corp | Fuel injection controlling method |
| JPS6095169A (en) * | 1983-10-31 | 1985-05-28 | Nissan Motor Co Ltd | Control device of air-fuel ratio |
| US4712522A (en) * | 1984-08-27 | 1987-12-15 | Toyota Jidosha Kabushiki Kaisha | Method and apparatus for controlling air-fuel ratio in internal combustion engine |
| CN101498254B (en) * | 2008-01-30 | 2010-11-10 | 华夏龙晖（北京）汽车电子科技有限公司 | Rapid warming-up method for gasoline engine |
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